[asterisk-dev] ToDo for chan_skinny

Pavel Jezek pavel.jezek at i.cz
Mon Jun 4 12:36:06 MST 2007

when I tested keepalive patch with other phone types, I discovered, that:
ci$co 7961 (and probably all never models 7941, 7911, 7921): is not 
supported at all by chan_skinny, phone doesn't even register 
ci$co 7912: when call rings-in, "End call" softkey button is displayed, 
but doesn't working (firmware 8.0(3))

Dan Austin wrote:
> Damien wrote:
>> Simon Lockhart wrote:
> <Snip>
>>> I'm fairly certain that chan_skinny already replies 
>>> to Keepalive messages from the phone (otherwise it 
>>> wouldn't work at all).
>>> Th problem is that if the phone stops sending keepalives
>>> (i.e. it goes away), then chan_skinny doesn't notice and
>>> still tries sending calls to the now non-existent phone.
>>> Simon
>>  My bad, it does too. Funny thing, it is one of the 
>> things that calls do_housekeeping, the others being 
>> hangups. So I guess you can't reliably use 
>> do_housekeeping to check if keepalives have been 
>> received as it relies on receiving keepalives for 
>> do_housekeeping to be called.
> All true.  The phone sends the keep-alive.  Chan_skinny
> responds.  It looked like it should go in do_housekeeping,
> but that won't work as it is not called unless it receives
> a keep-alive.
> But I believe I did find the issue.  In get_input() the
> code was using poll() with timeouts disabled.  Code to check
> for a dropped connection looked for a timeout, it was also
> in a section of code that was unlikely to be reached but
> not impossible.
> IF the phone dropped while sending a request, the current
> code would detect it and de-register the device.
> My fix was to add a timeout to the poll() call based on
> the configured keep_alive value +10% to handle network
> congestion, and to move the code that tested for timeouts
> into a code path that would regularly be reached.
> Light testing has been positive (I have one 7940 and one
> 7920).  Both have stayed registered overnight since I
> implemented the patch, and unplugging the network from the
> 7940 has it being de-registered in less than the 30 second
> keep_alive I used for testing.
> Dan
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